Genetic and family studies in psychiatric illness and alcohol and drug dependence.

Abstract excerpt

The high prevalence of comorbid psychiatric disorders among patients with substance dependence both confuses diagnosis and complicates treatment. One way of separating substance dependence and comorbid conditions is to use the family, rather than the individual, as the unit of study. Results from family, twin, and adoption studies indicate the existence of a heritable and specific liability to alcohol dependence...

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